diff --git a/apps/mobile-shell/scripts/check-config.mjs b/apps/mobile-shell/scripts/check-config.mjs
index 541144390..f798010fe 100644
--- a/apps/mobile-shell/scripts/check-config.mjs
+++ b/apps/mobile-shell/scripts/check-config.mjs
@@ -1110,7 +1110,13 @@ for (const snippet of [
 
 for (const snippet of [
   'type HostBridgeEventName',
+  'isHostBridgeEventName',
+  'function buildHostBridgeEventScript(event: HostBridgeEventName, payload: unknown)',
+  'if (!isHostBridgeEventName(event))',
+  'throw new Error(`unsupported HostBridge event ${event}`)',
+  'return buildHostBridgeMessageScript({',
   '(event: HostBridgeEventName, payload: unknown)',
+  'buildHostBridgeEventScript(event, payload)',
 ]) {
   if (!shellAppSource.includes(snippet)) {
     throw new Error(`mobile shell HostBridge event injection missing ${snippet}`);
diff --git a/apps/mobile-shell/src/shell/ShellApp.tsx b/apps/mobile-shell/src/shell/ShellApp.tsx
index e35009e22..7f7160b80 100644
--- a/apps/mobile-shell/src/shell/ShellApp.tsx
+++ b/apps/mobile-shell/src/shell/ShellApp.tsx
@@ -19,6 +19,7 @@ import {
   type HostBridgeEventName,
   HOST_BRIDGE_PROTOCOL,
   HOST_BRIDGE_VERSION,
+  isHostBridgeEventName,
 } from '../../../../packages/shared/src/contracts/hostBridge';
 import {
   configureMobileHostBridgeNavigation,
@@ -59,6 +60,19 @@ function buildHostBridgeMessageScript(message: unknown) {
   )}, origin: window.location.origin, source: window })); true;`;
 }
 
+function buildHostBridgeEventScript(event: HostBridgeEventName, payload: unknown) {
+  if (!isHostBridgeEventName(event)) {
+    throw new Error(`unsupported HostBridge event ${event}`);
+  }
+
+  return buildHostBridgeMessageScript({
+    bridge: HOST_BRIDGE_PROTOCOL,
+    version: HOST_BRIDGE_VERSION,
+    event,
+    payload,
+  });
+}
+
 type MobileWebViewLoadErrorEvent = {
   nativeEvent: {
     url: string;
@@ -103,12 +117,7 @@ export default function ShellApp() {
   const injectHostBridgeEvent = useCallback(
     (event: HostBridgeEventName, payload: unknown) => {
       webViewRef.current?.injectJavaScript(
-        buildHostBridgeMessageScript({
-          bridge: HOST_BRIDGE_PROTOCOL,
-          version: HOST_BRIDGE_VERSION,
-          event,
-          payload,
-        }),
+        buildHostBridgeEventScript(event, payload),
       );
     },
     [],
diff --git a/docs/project-memory/shared-memory/decision-log.md b/docs/project-memory/shared-memory/decision-log.md
index cf2ecd593..2aaacb857 100644
--- a/docs/project-memory/shared-memory/decision-log.md
+++ b/docs/project-memory/shared-memory/decision-log.md
@@ -2551,6 +2551,7 @@
 
 - 背景：H5 主站会同时承载原生壳 HostBridge 和后续 AI H5 sandbox / GameBridge；如果 H5 侧只按 JSON envelope 识别 HostBridge response / event，sandbox iframe 可以构造同形 `postMessage` 干扰待处理宿主请求或伪造宿主事件。
 - 决策：Expo 和 Tauri 注入给 H5 的 HostBridge response / event 统一带 `origin: window.location.origin` 和 `source: window`；`nativeAppHostBridge` listener 只接受无外部 source 或当前窗口 source 的消息，并拒绝非当前页面 origin。AI sandbox 后续继续使用独立 GameBridge allowlist，不允许直接结算 HostBridge 请求。
+- 追加：Expo 移动壳事件注入必须在运行时调用共享 `isHostBridgeEventName()` 校验事件名，只有 `HOST_BRIDGE_EVENTS` 中的事件才能生成注入脚本；普通 response 仍可复用统一 message script，但不能绕过事件 allowlist 伪造新的宿主事件类型。`apps/mobile-shell/scripts/check-config.mjs` 必须反查该校验。
 - 影响范围：`apps/mobile-shell/App.tsx`、`apps/desktop-shell/src-tauri/src/main.rs`、`src/services/host-bridge/nativeAppHostBridge.ts`、两端壳配置检查和 HostBridge 方案文档。
 - 验证方式：`npm run check:native-shells`、`npm run test -- src/services/host-bridge/nativeAppHostBridge.test.ts src/services/host-bridge/hostBridge.test.ts`、`npm run typecheck`、`npm run check:encoding`、`git diff --check`。